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--This is another --lua-exec demo. It displays a menu to a user, waits for her
--input and makes a decision according to what the user entered. All happens
--in an infinite loop.
--This function reads a line of at most 8096 bytes (or whatever the first
--parameter says) from standard input. Returns the string and a boolean value
--that is true if we hit the newline (defined as "\n") or false if the line had
--to be truncated. This is here because io.stdin:read("*line") could lead to
--memory exhaustion if we received gigabytes of characters with no newline.
function read_line(max_len)
local ret = ""
for i = 1, (max_len or 8096) do
local chr = io.read(1)
if chr == "\n" then
return ret, true
end
ret = ret .. chr
end
return ret, false
end
while true do
print "Here's a menu for you: "
print "1. Repeat the menu."
print "0. Exit."
io.write "Please enter your choice: "
io.flush(io.stdout)
i = read_line()
--WARNING! Without this line, the script will go into an infinite loop
--that keeps consuming system resources when the connection gets broken.
--Ncat's subprocesses are NOT killed in this case!
if i == nil then
break
end
print("You wrote: ", i, ".")
if i == "0" then
break
elseif i == "1" then
print "As you wish."
else
print "No idea what you meant. Please try again."
end
print() --print a newline
end
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